PyElementGeneratorImpl.java 文件源码

@Override
@NotNull
public PsiElement insertItemIntoListRemoveRedundantCommas(
  @NotNull final PyElement list,
  @Nullable final PyExpression afterThis,
  @NotNull final PyExpression toInsert) {
  // TODO: #insertItemIntoList is probably buggy. In such case, fix it and get rid of this method
  final PsiElement result = insertItemIntoList(list, afterThis, toInsert);
  final LeafPsiElement[] leafs = PsiTreeUtil.getChildrenOfType(list, LeafPsiElement.class);
  if (leafs != null) {
    final Deque<LeafPsiElement> commas = Queues.newArrayDeque(Collections2.filter(Arrays.asList(leafs), COMMAS_ONLY));
    if (!commas.isEmpty()) {
      final LeafPsiElement lastComma = commas.getLast();
      if (PsiTreeUtil.getNextSiblingOfType(lastComma, PyExpression.class) == null) { //Comma has no expression after it
        lastComma.delete();
      }
    }
  }

  return result;
}